1796 Riga
| Discovery [1] | |
|---|---|
| Discovered by | N. Chernykh |
| Discovery site | CrAO - Nauchnyj |
| Discovery date | 16 May 1966 |
| Designations | |
| MPC designation | 1796 Riga |
Named after |
Riga (capital city)[2] |
|
1966 KB · 1935 GE 1941 FC1 · 1947 GA 1950 TF2 · 1953 GW 1960 JA · A907 TG A907 UD | |
| main-belt (outer) | |
| Orbital characteristics [1] | |
| Epoch 27 June 2015 (JD 2457200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 62.40 yr (22,792 days) |
| Aphelion | 3.5448 AU |
| Perihelion | 3.1646 AU |
| 3.3547 AU | |
| Eccentricity | 0.0566 |
| 6.14 yr (2,244 days) | |
| 14.553° | |
| Inclination | 22.585° |
| 186.73° | |
| 24.904° | |
| Physical characteristics | |
| Dimensions |
73.83 km[3] 85.79±1.57 km[4] 68.089±1.037 km[5] 71±7 km[6] |
|
10.608 h[7] 11.0±0.01 h[8] 16 h[9] | |
|
0.0376[3] 0.028±0.001[4] 0.0442±0.0082[5] 0.04±0.01[6] | |
|
B–V = 0.676 U–B = 0.289 XFCU (Tholen) Cb (SMASS) C [10] | |
| 9.84 | |
|
| |
1796 Riga, provisional designation 1966 KB, is a dark asteroid from the outer region of the asteroid belt, about 74 kilometers in diameter. It was discovered by Russian astronomer Nikolai Chernykh at the Crimean Astrophysical Observatory in Nauchnyj on 16 May 1966.[11]
The carbonaceous asteroid is classified as a XFCU and Cb subtype in the Tholen and SMASS taxonomy scheme, respectively. It orbits the Sun at a distance of 3.2–3.5 AU once every 6 years and 2 months (2,244 days). Its orbit shows an eccentricity of 0.06 and is notably tilted by 23 degrees to the plane of the ecliptic. It has a rather long rotation period of 10.6 hours,[7][8] with an alternative observation that gave 16 hours.[9] The body has a low geometric albedo around 0.04, according to the surveys carried out by IRAS, Akari, WISE and NEOWISE.[3][4][5][6]
The minor planet was named after Riga, the capital of Latvia and site of the Astronomical Observatory of the University of Latvia. The name was proposed by Matiss A. Dirikis, who was a member of the observatory at the Latvian State University, and after whom the asteroid 1805 Dirikis is named.[2]
References
- 1 2 "JPL Small-Body Database Browser: 1796 Riga (1966 KB)" (2015-08-29 last obs.). Jet Propulsion Laboratory. Retrieved November 2015.
- 1 2 Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (1796) Riga. Springer Berlin Heidelberg. p. 144. ISBN 978-3-540-29925-7. Retrieved November 2015.
- 1 2 3 Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System. Bibcode:2004PDSS...12.....T. Retrieved November 2015.
- 1 2 3 Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. Retrieved November 2015.
- 1 2 3 Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved November 2015.
- 1 2 3 Alí-Lagoa, V.; de León, J.; Licandro, J.; Delbó, M.; Campins, H.; Pinilla-Alonso, N.; Kelley, M. S. (June 2013). "Physical properties of B-type asteroids from WISE data". Astronomy & Astrophysics 554: 16. arXiv:1303.5487. Bibcode:2013A&A...554A..71A. doi:10.1051/0004-6361/201220680. Retrieved November 2015.
- 1 2 Warner, Brian D. (April 2011). "Upon Further Review: VI. An Examination of Previous Lightcurve Analysis from the Palmer Divide Observatory". Bulletin of the Minor Planets (Section of the Association of Lunar and Planetary Observers) 38 (2): 96–101. Bibcode:2011MPBu...38...96W. ISSN 1052-8091. Retrieved November 2015.
- 1 2 Warner, Brian D. (March 2004). "Rotation rates for asteroids 875, 926, 1679, 1796, 3915, 4209, and 34817". Bulletin of the Minor Planets (Section of the Association of Lunar and Planetary Observers) 31 (1): 19–22. Bibcode:2004MPBu...31...19W. ISSN 1052-8091. Retrieved November 2015.
- 1 2 Chiorny, V. G.; Shevchenko, V. G.; Krugly, Yu. N.; Velichko, F. P.; Gaftonyuk, N. M. (May 2007). "Photometry of asteroids: Lightcurves of 24 asteroids obtained in 1993 2005". Planetary and Space Science 55 (7-8): 986–997. Bibcode:2007P&SS...55..986C. doi:10.1016/j.pss.2007.01.001. Retrieved November 2015.
- ↑ "LCDB Data for (1796) Riga". Asteroid Lightcurve Database (LCDB). Retrieved November 2015.
- ↑ "1796 Riga (1966 KB)". Minor Planet Center. Retrieved November 2015.
External links
- Asteroid Lightcurve Database (LCDB), query form (info)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
- 1796 Riga at the JPL Small-Body Database
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